Bridge Scour Evaluation - Plan of Action s1

BRIDGE SCOUR EVALUATION - PLAN OF ACTION Br. No. Owner Location Facility Carried Name 53C0589 Los Angeles 0.1 MI W/O VALYERMO RD BIG ROCK CREEK County BOBS GAP RD

Plan of Action Date of Completed By: Completion:

1. SCOUR VULNERABILITY RATING

Scour Evaluation Summary:

Scour History:

a. Foundation Type Spread footing Pile Extension Footing on Piles Unknown b. Foundation Material Known ______Unknown Scour Review: Done By: Date:

Structural Assessment:Done By: Date:  Critical Elevation: ______Geotechnical Assessment: Done By: Date: Critical Elevation: ______

2. NBIS CODING INFORMATION Most Recent Inspection date 5/11/04 Item 113 Scour 3 Item 60 Substructure 7 Item 61 Channel & Channel Protection 4 Item 71 Waterway Adequacy 5 3. COUNTERMEASURE RECOMMENDATION A. Completed Countermeasures:

B. Proposed Countermeasures:

Countermeasures Not Required. (Please explain)

Install Scour Countermeasures (See 4 and 5) Estimated Cost Riprap with monitoring program $ Guide bank

$ Spurs / Bendway weirs / Barbs $ Relief bridge / Culvert $ Channel improvements $ Monitoring

$ Monitoring device $ Check Dam $ Substructure Modification $ Bridge replacement $ Other ______$

Close Bridge (See 6)

4. COUNTERMEASURE IMPLEMENTATION SCHEDULE Countermeasure Implementation Project Type: Proposed Construction Project Lead Agency Maintenance Project

Advertised Date:

Other scheduling information: 5. MONITORING PLAN Monitoring Plan Summary:

Monitoring Authority:

Regular Inspection Program of ______mo. w/surveyed cross sections Items to Watch: undermining the footing Increased Inspection Interval of ______mo. w/surveyed cross sections Items to Watch:. Underwater Inspection Program Frequency ______mo. Items to Watch: Fixed Monitoring Device Type of Instrument: Installation location(s): Sample Interval: 30 min. 1 hr. 6 hrs. 12 hrs. Other ______Frequency of data logger downloading: Weekly Bi-weekly Monthly

Other ______Scour-critical discharge: ______Action required if scour-critical elevation detected:

Other Monitoring Program Type: Visual Instrument  Portable Geophysical Sonar  Other gages Flood monitoring required: Yes No Flood monitoring event defined by: Discharge over ______Stage ______Elev. measured from ______Frequency of flood monitoring: 1 hr. 3 hr. 6 hrs. Other Scour critical elevation: Action required if scour-critical elevation detected: 6. BRIDGE CLOSURE PLAN

Bridge ADT: 1500 Built: 1927 % Trucks: 1 Bridge Length (ft): 161.1 Closure Plan Summary

Scour Monitoring Criteria for Consideration of Bridge Closure: Water surface elevation reaches Overtopping road or structure Scour Measurement Results / Monitoring Device Loss of Riprap Observed amount of Settlement Loss of Road Embankment Debris Accumulation Other Person / Area Responsible for Closure:

Contact People (Name & Phone No.):

Responsible for re-opening after inspection:

7. DETOUR ROUTE Detour route description (route number, from - to, etc.) – attach map.

Average ADT: Year: % Trucks: Length: Bridges on Detour Route: Bridge Number Waterway Sufficiency Rating/ Load limitations Scour 113 code BRIDGE SCOUR EVALUATION - PLAN OF ACTION Br. No. Owner Location Facility Carried Name 53C0620 Los Angeles 4 MI S MALIBU CYN RD MALIBU CREEK County VENTURA FWY

Scour History:

2. NBIS CODING INFORMATION Most Recent Inspection date 3/10/03 Item 113 Scour 3 Item 60 Substructure 7 Item 61 Channel & Channel Protection 7 Item 71 Waterway Adequacy 7 3. COUNTERMEASURE RECOMMENDATION C. Completed Countermeasures:

D. Proposed Countermeasures:

Advertised Date:

Average ADT: Year: % Trucks: Length: Bridges on Detour Route: Bridge Number Waterway Sufficiency Rating/ Load limitations Scour 113 code BRIDGE SCOUR EVALUATION - PLAN OF ACTION Br. No. Owner Location Facility Carried Name 53C0828 CITY OF 1.5 MI S LINDERO TRIUNFO CANYON WESTLAKE VENTURA FWY CANYON ROA CREEK VILLAGE

Scour History:

2. NBIS CODING INFORMATION Most Recent Inspection date 7/22/04 Item 113 Scour 2 Item 60 Substructure 7 Item 61 Channel & Channel Protection 7 Item 71 Waterway Adequacy 8 3. COUNTERMEASURE RECOMMENDATION E. Completed Countermeasures:

F. Proposed Countermeasures:

Advertised Date:

Average ADT: Year: % Trucks: Length: Bridges on Detour Route: Bridge Number Waterway Sufficiency Rating/ Load limitations Scour 113 code BRIDGE SCOUR EVALUATION - PLAN OF ACTION Br. No. Owner Location Facility Carried Name 53C1004 Los Angeles 0.25 MI S OF CRAGS DRIVE TRIFUNO CREEK County MULHOLLAND W

Scour History:

2. NBIS CODING INFORMATION Most Recent Inspection date 12/3/01 Item 113 Scour 3 Item 60 Substructure 7 Item 61 Channel & Channel Protection 6 Item 71 Waterway Adequacy 8 3. COUNTERMEASURE RECOMMENDATION G. Completed Countermeasures:

H. Proposed Countermeasures:

Advertised Date:

Average ADT: Year: % Trucks: Length: Bridges on Detour Route: Bridge Number Waterway Sufficiency Rating/ Load limitations Scour 113 code